Watchcase



Irfan/EY Oct. 13, 1942.

M. SCHECHMER WATCHCASE Filed Jan. 28, 1941 Patented Oct. 13, 1942 E UNITED STATES PATENT OFFICE 3 Claims.

My invention relates to watches of the class known as waterprooff In such watches the greatest diculty is encountered in preventing the ingress of water, dust or moisture through the necessary opening which must be provided for the watch stem which must be rotatable to wind the watch and movable longitudinally to set the hands of the watch.

Among the means at present and in most general use is a packing usually a sleeve of rubber which is pro-vided to surround the stem. These sleeves, however, in a comparatively short time become worn or oxidized sc that they no longer tightly engage the stem and its aperture, with the result that the packing fails of its purpose.

Another method is a rather elaborate spring mechanism enclosed in the crown. The springs thus employed break and the device then becomes inoperative.

My invention has for its principal object to render the watch impervious to water, dust and moisture without employing any packing of any sort whatsoever.

A further object is to provide a construction for that purpose without employing springs of any form.

A further object is to provide a construction which, in a simple and inexpensive manner, will permit both winding and setting the watch in the usual manner.

A further object is to attain these objects Without the necessity of employing gaskets, or any parts formed of expendible material.

Another diiculty encountered in watches generally is that the stem being, of very small diameter, is easily broken when subjected to a shock at the crown.

Further object of my invention is to provide a construction which will protect the stem of a watch against breakage due to sudden shock by employing an auxiliary stern of larger diameter at the aperture into the watch case.

My means of accomplishing the foregoing objects may be fully comprehended by having reierence to the accompanying drawing, which is hereunto annexed and is a part of this specification in which similar reference numerals refer to similar parts throughout.

Fig. 1 is a fragmentary elevational view showing my device applied to the watch case;

Fig. 2 is a cross-sectional View showing my device in inoperative position;

my device in operative position for the resetting and winding of the watch;

Fig. 4 is a cross-section taken on the line 4-4 of Fig. 3;

Fig. 5 is an exploded detail View of the parts which go to make up my device; and

Fig. 6 is a modification of my device.

In the drawing I have shown only a fragmentary portion of the Watch case I0 as it is of the conventional design which is well known to the industry.

In the periphery of the case I0 is mounted a bushing II, which is provided with internal threads I2 to which is tted the external threads I4 on a reduced portion I5 of a tubular sleeve I S. The reduced portion forms a shoulder II which is adapted to abut the bushing II and form a tight joint.

The upper end of the tubular sleeve I6 is closed by a crown I3, of standard construction which is preferably secured to the sleeve by solder or by sweating or in any other suitable or desired manner in order to effect a seal which will be impervious to water, dust or moisture.

The periphery of the crown is provided with the conventional knurling for convenient manipulation such as is required for winding or setting the watch.

Within the tubular sleeve I6 I mount an auxiliary stem I8 which is longitudinally slidable therein.

This auxiliary stem I8 is provided with a head I9 as clearly seen in Fig. 5 from the lower sur- 'iace of which projects pins 20 and 22 which are fitted to and adapted to engage corresponding recesses 24 and 26 which are drilled, cast or otherwise formed in an internal shoulder 21 formed on the inside of the tubular sleeve I6.

This sleeve has its lower portion I5 provided with a central axial opening 28 to which is fitted the auxiliary stem I8. The opening 28 serves to center and also acts as a guide for the auxiliary stem I8. The upper portion of the tubular sleeve I6 is bored out to t the head I9 of the auxiliary stem I8. The end 29 of the auxiliary stem I8 is provided with internal threads 30 which t the stem of a standard watch. This is not shown nor is it deemed necessary to describe it or its operation in detail since its construction and operation are well known to persons skilled in the art.

The operation of my improvement is as follows:

The crown I3 is rotated in a counter-clockwise Fig. 3 is a view similar to Fig. 2, but showingr 55 direction to unscrew the tubular sleeve I6 from the bushing Il. When it is free as seen in Fig. 3, the sleeve is then drawn outwardly until the pins Z and 22 engage the recesses 24 and 26 at which point rotation of the crown in clockwise direction will carry with it the auxiliary stem and in turn the watch stem (not shown) and the watch will be wound.

Further withdrawal will cause the watch stem to be disengaged from the winding position and move it to the setting position and the hands of the watch may be moved to the correct position.

This actuation of the parts being those ofV the standard watch movements, they will be clearly understood by those persons engaged in' the industry. Y

Obviously, the reverse movement `will'free the pins 20 and 22 from the recesses 24 and 2S and the tubular sleeve can be screwed tightly in place thus rendering the watch impervious to' water, dust or moisture.

From the foregoing it will be seen that I have been able to construct a water, dust or moisture proof watch without having to employv any sleeves of expendible material or any springs which are liable to be broken in use.

In Fig. 6 I showV a slightly `modied construction of the bushing. As shown inthis View the bushing is provided with an Vextension 32 which is provided with external `threads 34.l Thetubular sleeve I6 in this form is provided with internal threads 35 which t the threads 32.

Y Otherwise the construction is the same andthe operation is identical. The foregoing description and drawing is furnished solely for illustration purposes and not in any manner asa limitation upon my invention, and I do not intend to be limited to the specific detailsshown .and described except as such limitations appear in the hereinafter contained claims.

Having described my invention, what I regard as new and desire -to secure by Letters Patent is:

1. In a'watch having a stem andan aperture in its periphery for said stern; a bushing mounted in said aperture, threads on said bushing, atubular sleeve which is adapted to be threaded on said bushing and seal the same, a crown ixedly mounted on the outer end of said tubular sleeve, an internal shoulder in said sleeve, there being recesses in said shoulder and an auxiliary stem adapted to engage the stem of the watch, said stern being mounted in said sleeve and longitudinally slidable therein, a head on said stem and pins on the lower side of said head which engage 10 saidrecesses.

2. In a watch having a stem and an aperture in its periphery for said stem; an internal bushing iixedly mounted in said aperture, a tubular sleeve having external threads which t the .threads in said bushing, an external shoulder on said sleeve which abuts said bushing forming a sealed joint, a crown which closes the upper end of said tubular sleeve and which is hermetically attached thereto, an internal shoulder in said tubular sleeve, said shoulder having recesses, an auxiliary stem adapted to engage the stem of the watch, said auxiliary stem'being mounted in said tubular sleeve,pthere being a recess in said shoulder, a head on said auxiliary stem,pins on the lower side of-said head formed integral therewith, adapted to engage'the recesses in the shoulder on the tubular sleeve.

3. In a watch having a stem and an aperture in its periphery for said stem; an internalbushingmountedin said aperture, a tubular sleeve, external threads thereon which t the threads in said bushing, :an external Vshoulder 'onsaid sleeve which-abuts said bushing forming a sealed joint-a crown on theupperend of said tubular sleeve and which is hermetically attached thereto, an internal shoulder in said tubularY sleeve, said shoulder having recesses therein, an auxiliary stem Vadapted to engage-the stemof the watch, said auxiliary stem being mounted in-.said

4o tubular sleeve, there being recessesvin said .shoulder, a head on said auxiliary stem, .pins on the lower side of said headV formed VVintegral. therewith,- adapted .to engage the recesses in -theshoulder on the tubular sleeve.

MAX 'SCHECHMQ-JR. 

